linux-kernel - Re: [PATCH v2] i2c: rk3x: fix divisor calculation for SCL frequency

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20140920121904.GB3850@katana>
Date:	Sat, 20 Sep 2014 14:19:05 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Addy Ke <addy.ke@...k-chips.com>
Cc:	max.schwarz@...ine.de, heiko@...ech.de, olof@...om.net,
	dianders@...omium.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, cf@...k-chips.com,
	xjq@...k-chips.com, huangtao@...k-chips.com, zyw@...k-chips.com,
	yzq@...k-chips.com, hj@...k-chips.com, kever.yang@...k-chips.com,
	hl@...k-chips.com, caesar.wang@...k-chips.com,
	zhengsq@...k-chips.com
Subject: Re: [PATCH v2] i2c: rk3x: fix divisor calculation for SCL frequency

On Mon, Sep 08, 2014 at 11:38:25AM +0800, Addy Ke wrote:
> I2C_CLKDIV register descripted in the previous version of
> RK3x chip manual is incorrect. Plus 1 is required.
> 
> The correct formula:
> - T(SCL_HIGH) = T(PCLK) * (CLKDIVH + 1) * 8
> - T(SCL_LOW) = T(PCLK) * (CLKDIVL + 1) * 8
> - (SCL Divsor) = 8 * ((CLKDIVL + 1) + (CLKDIVH + 1))
> - SCL = PCLK / (CLK Divsor)
> 
> It will be updated to the latest version of chip manual.
> 
> Signed-off-by: Addy Ke <addy.ke@...k-chips.com>

Applied to for-next, thanks!


Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)